18980779 has 2 divisors, whose sum is σ = 18980780. Its totient is φ = 18980778.

The previous prime is 18980749. The next prime is 18980783. The reversal of 18980779 is 97708981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18980779 - 2¹⁷ = 18849707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18980729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9490389 + 9490390.

It is an arithmetic number, because the mean of its divisors is an integer number (9490390).

Almost surely, 2^18980779 is an apocalyptic number.

18980779 is a deficient number, since it is larger than the sum of its proper divisors (1).

18980779 is an equidigital number, since it uses as much as digits as its factorization.

18980779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 18980779 is about 4356.6935857368. The cubic root of 18980779 is about 266.7501532000.

The spelling of 18980779 in words is "eighteen million, nine hundred eighty thousand, seven hundred seventy-nine".